I was in the 6th grade when I first heard Britney Spears' now iconic debut single, "...Baby One More Time." It was a game-changing moment for 11-year-old Alex, to say the least. "Who is this girl?" I wondered. "Where did she come from? ...And why does she say 'baby' like that?" I immediately demanded that my mom drive me to Target so I could buy the CD single. We didn't have cable, but I relished the opportunity to watch the music video on MTV's TRL at friends' houses. There was just something about Spears that was so utterly captivating.

Over 16 years later, there still is.

Sure, she may not dance as well as she used to and we don't hear her sing live much anymore, but there's no denying that Spears still has "it." Charisma, allure, charm, magnetism, "the X factor" — whatever you want to call it — Spears has got it (and she's got it in spades). Since she first burst onto the scene in 1998, she's sold over 100 million albums worldwide. Today, people are still flocking in droves (and paying top dollar) to see Spears perform live in her "Britney: Piece of Me" show in Las Vegas. That, my friends, is true star power.

In honor of the 10th anniversary of Spears' first greatest hits compilation, Greatest Hits: My Prerogative, let's take a look back at all 39 singles she's released as a lead artist worldwide — from the totally incredible to the totally forgettable:

#39. "From the Bottom of My Broken Heart" from ...Baby One More Time (Dec. 1999)

BritneySpearsVEVO on YouTube

I can roll with cheesy, but "From the Bottom of My Broken Heart" is just too much (even for me).

#16. "Outrageous" from In the Zone (July 2004)

#15. "Radar" from Circus (June 2009)

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"Radar" actually first appeared as a bonus track on Blackout, but then, because it's way too good to be left as a bonus track, it was put on the standard edition of Spears' next album, Circus. I can't get enough of it. The hooks are flawless.

#14. "Lucky" from Oops! I Did It Again (Aug. 2000)

BritneySpearsVEVO on YouTube

The bubblegum pop gloss of "Lucky" disguises even the songs most devastating lyrics: "If there's nothing missing in my life, then why do these tears come at night?" Whoa. Whoa.

#13. "Hold It Against Me" from Femme Fatale (Jan. 2011)

BritneySpearsVEVO on YouTube

As far as I'm concerned, Spears started the dubstep trend in pop music in the United States with "Hold It Against Me." The song's wobbly middle eight section is a major "wow" moment, that's for sure.

#12. "Oops! ...I Did It Again" from Oops! I Did It Again (Mar. 2000)

BritneySpearsVEVO on YouTube

Who could forget "Oops! ...I Did It Again's" corny spoken bridge, complete with Titanic reference?

#11. "Circus" from Circus (Dec. 2008)

BritneySpearsVEVO on YouTube

Given Spears' public breakdown in 2007, these two particular lines from "Circus" give me the chills: "I feel the adrenaline movin' through my veins/Spotlight on me and I'm ready to break..."

#10. "Everytime" from In the Zone (May 2004)

BritneySpearsVEVO on YouTube

"Everytime" is a simple song, but its effect is powerful.

#9. "Me Against the Music" (feat. Madonna) from In the Zone (Oct. 2003)

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What a freakin' chorus. Also, Madonna.

#8. "(You Drive Me) Crazy" (The Stop Remix!) from ...Baby One More Time (Aug. 1999)

#5. "I'm a Slave 4 U" from Britney (Sept. 2001)

#4. "...Baby One More Time" from ...Baby One More Time (Sept. 1998)

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The song that started it all.

#3. "Piece of Me" from Blackout (Nov. 2007)

BritneySpearsVEVO on YouTube

Are these the most explicitly feminist lyrics in Spears' discography?: "I'm Miss Bad Media Karma/Another day, another drama/Guess I can't see the harm in workin' and being a mama/And with a kid on my arm/I'm still an exceptional earner/And you want a piece of me?"

#2. "Toxic" from In the Zone (Jan. 2004)

BritneySpearsVEVO on YouTube

"Toxic" was nominated for Best Dance Recording at the 47th Annual Grammy Awards in 2005. Thankfully, it won. Woo hoo!

#1. "Till the World Ends" from Femme Fatale (Mar. 2011)

BritneySpearsVEVO on YouTube

I realize that "Till the World Ends" might be a controversial choice for Spears' best single to date, but I grow more and more in love with the track with each listen. From its sexy verses to its massive chorus to its even more massive surprise second chorus (which shows up around the 2:34 mark), "Till the World Ends" is a musical thrill ride that only Spears could deliver. Like I said, she just has it.